Only the ocean / Natasha Carthew.

Fifteen-year-old Kel Crow lives in the swamp slums, selling drugs for a family with whom she shares nothing but blood. Kel has only one thing on her mind and that's survival; to survive the heart defect she has had since birth. So when the opportunity to escape comes her way she takes it: setting off on a journey to kidnap a girl for a ransom that might pay for the heart operation to save her life. But soon she is in deep water as the world storms around her and things take a turn for the worse in a society that is split between those who inhabit the swampland and those who live in the sky towers. Kel thinks life is over before it's started, but if she can find the will to fight back, she may discover it is just beginning. Only The Ocean is a story about the loss of innocence and of youth and the courage that comes from overcoming adversity through hope, healing and ultimately love. Perfect for fans of Sarah Crossan, Patrick Ness and Meg Rosoff.